Jakub Połeć

Quantitative systems / investment infrastructure

Portrait of Jakub Połeć
“Independent review before you allocate capital, acquire technology, or put a system into production.”
How I help

I review and design quantitative systems, investment infrastructure, and the research behind them—and put the answer in writing.

I work with hedge funds, family offices, asset managers, and investors in investment technology. My background spans high-energy physics at CERN, Microsoft, Oracle, and more than a decade building data-intensive, AI, and quantitative systems.

I co-founded and led three technology companies. I now run QuantJourney, which builds investment infrastructure for buy-side teams.

Based in Dubai, UAE. I do not manage client capital and do not give investment advice.

Validate a system

Someone claims a system works, and the decision depends on whether that is true.

Check before allocating capital

A strategy is about to receive capital, and nobody in the room has independently checked the research behind it.

Untangle the infrastructure

Research, data, portfolio, risk, and execution have grown into something nobody can trace end to end, and a decision has to be made about what to build, buy, or replace.

Get in touch with Jakub
20+ yrstechnology & data systems
5+ yrsquant & investment systems
100+paying API & infrastructure customers
3companies co-founded & led

Independent review, architecture and due diligence

I take a small number of engagements at a time. Each one is fixed-scope, written up, and delivered on a date agreed in advance.

Recent work spans quantitative research, investment systems and technology review for buy-side firms across the US, India, Japan and the Middle East.

Strategy and backtest review

Before capital is committed or a strategy goes into production, I review the research behind it: data quality and point-in-time integrity, assumptions, portfolio construction, transaction costs, and the risk of overfitting or information leakage.

You receive: a written assessment of what the evidence supports, where the results may be misleading and which issues need further testing or correction.

Full scope
2-3 weeks $7,500

Investment systems architecture

When research, data, portfolio management, risk, and execution need to work together, I design the architecture or assess what is already in place. I examine data flows, system boundaries, and operational requirements, including how decisions and results can be traced and reproduced.

You receive: an architecture proposal and an implementation roadmap, with priorities, dependencies, and technical trade-offs made explicit.

Full scope
4-6 weeks $18,000

Quant and investment technology due diligence

Before investing in a business, selecting a platform or committing to a major technology project, I independently assess the underlying technology, models and engineering practices. I examine whether the system supports its claims and what it will take to operate, maintain and extend it.

You receive: a structured assessment of strengths, material risks, unresolved questions and recommended next steps.

Full scope
2-4 weeks $15,000

QuantJourney systems

QuantJourney is my company. Together with my team, I build and operate investment systems used across research, portfolio management, risk, data, execution, and applied AI.

Book and selected research

Quant Interviews Volume I cover Quant Interviews Volume II cover

From mathematical foundations to production-grade quant systems.

1,630 pages · 194 questions · Python / C++ / SQL

Open the book

Selected Research

On the QuantJourney blog, I have published 250+ articles covering investment strategies, alpha research, backtesting, portfolio construction, risk, data engineering, execution, and applied AI.

Padel/Diving/Action movies/Puzzles/Foodie/Travel/

Bring the decision you are facing and whatever material you have.

In thirty minutes, I will tell you whether I can help, what it would take, and what it would cost.

Book a 30-minute call Email me
Jakub's black cocker spaniel resting on a sofa